fix(all): Update hand-written clients to not use WithEndpoint override (

#3111)

-logging clients delegate to the gapic generated client with the correct defaults, so no need to override.
-bigtable and spanner clients needs to be manually updated to use DefaultEndpoint and DefaultMTLSEndpoint

bigtable/admin.go

@@ -44,6 +44,7 @@ import (
 )
 
 const adminAddr = "bigtableadmin.googleapis.com:443"
+const mtlsAdminAddr = "bigtableadmin.mtls.googleapis.com:443"
 
 // ErrPartiallyUnavailable is returned when some locations (clusters) are
 // unavailable. Both partial results (retrieved from available locations)
@@ -70,7 +71,7 @@ type AdminClient struct {
 
 // NewAdminClient creates a new AdminClient for a given project and instance.
 func NewAdminClient(ctx context.Context, project, instance string, opts ...option.ClientOption) (*AdminClient, error) {
-	o, err := btopt.DefaultClientOptions(adminAddr, AdminScope, clientUserAgent)
+	o, err := btopt.DefaultClientOptions(adminAddr, mtlsAdminAddr, AdminScope, clientUserAgent)
 	if err != nil {
 		return nil, err
 	}
@@ -603,6 +604,7 @@ func (ac *AdminClient) TableIAM(tableID string) *iam.Handle {
 }
 
 const instanceAdminAddr = "bigtableadmin.googleapis.com:443"
+const mtlsInstanceAdminAddr = "bigtableadmin.mtls.googleapis.com:443"
 
 // InstanceAdminClient is a client type for performing admin operations on instances.
 // These operations can be substantially more dangerous than those provided by AdminClient.
@@ -619,7 +621,7 @@ type InstanceAdminClient struct {
 
 // NewInstanceAdminClient creates a new InstanceAdminClient for a given project.
 func NewInstanceAdminClient(ctx context.Context, project string, opts ...option.ClientOption) (*InstanceAdminClient, error) {
-	o, err := btopt.DefaultClientOptions(instanceAdminAddr, InstanceAdminScope, clientUserAgent)
+	o, err := btopt.DefaultClientOptions(instanceAdminAddr, mtlsInstanceAdminAddr, InstanceAdminScope, clientUserAgent)
 	if err != nil {
 		return nil, err
 	}

bigtable/bigtable.go

@@ -39,6 +39,7 @@ import (
 )
 
 const prodAddr = "bigtable.googleapis.com:443"
+const mtlsProdAddr = "bigtable.mtls.googleapis.com:443"
 
 // Client is a client for reading and writing data to tables in an instance.
 //
@@ -65,7 +66,7 @@ func NewClient(ctx context.Context, project, instance string, opts ...option.Cli
 
 // NewClientWithConfig creates a new client with the given config.
 func NewClientWithConfig(ctx context.Context, project, instance string, config ClientConfig, opts ...option.ClientOption) (*Client, error) {
-	o, err := btopt.DefaultClientOptions(prodAddr, Scope, clientUserAgent)
+	o, err := btopt.DefaultClientOptions(prodAddr, mtlsProdAddr, Scope, clientUserAgent)
 	if err != nil {
 		return nil, err
 	}

bigtable/export_test.go

@@ -138,7 +138,7 @@ var headersInterceptor = testutil.DefaultHeadersEnforcer()
 
 // NewAdminClient builds a new connected admin client for this environment
 func (e *EmulatedEnv) NewAdminClient() (*AdminClient, error) {
-	o, err := btopt.DefaultClientOptions(e.server.Addr, AdminScope, clientUserAgent)
+	o, err := btopt.DefaultClientOptions(e.server.Addr, e.server.Addr, AdminScope, clientUserAgent)
 	if err != nil {
 		return nil, err
 	}
@@ -170,7 +170,7 @@ func (e *EmulatedEnv) NewInstanceAdminClient() (*InstanceAdminClient, error) {
 
 // NewClient builds a new connected data client for this environment
 func (e *EmulatedEnv) NewClient() (*Client, error) {
-	o, err := btopt.DefaultClientOptions(e.server.Addr, Scope, clientUserAgent)
+	o, err := btopt.DefaultClientOptions(e.server.Addr, e.server.Addr, Scope, clientUserAgent)
 	if err != nil {
 		return nil, err
 	}

bigtable/internal/option/option.go

@@ -25,6 +25,7 @@ import (
 	"cloud.google.com/go/internal/version"
 	gax "github.com/googleapis/gax-go/v2"
 	"google.golang.org/api/option"
+	"google.golang.org/api/option/internaloption"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/metadata"
 )
@@ -76,7 +77,7 @@ func unaryInterceptor(ctx context.Context, method string, req, reply interface{}
 
 // DefaultClientOptions returns the default client options to use for the
 // client's gRPC connection.
-func DefaultClientOptions(endpoint, scope, userAgent string) ([]option.ClientOption, error) {
+func DefaultClientOptions(endpoint, mtlsEndpoint, scope, userAgent string) ([]option.ClientOption, error) {
 	var o []option.ClientOption
 	// Check the environment variables for the bigtable emulator.
 	// Dial it directly and don't pass any credentials.
@@ -88,7 +89,8 @@ func DefaultClientOptions(endpoint, scope, userAgent string) ([]option.ClientOpt
 		o = []option.ClientOption{option.WithGRPCConn(conn)}
 	} else {
 		o = []option.ClientOption{
-			option.WithEndpoint(endpoint),
+			internaloption.WithDefaultEndpoint(endpoint),
+			internaloption.WithDefaultMTLSEndpoint(mtlsEndpoint),
 			option.WithScopes(scope),
 			option.WithUserAgent(userAgent),
 		}

logging/logadmin/logadmin.go

@@ -66,7 +66,6 @@ func NewClient(ctx context.Context, parent string, opts ...option.ClientOption)
 		parent = "projects/" + parent
 	}
 	opts = append([]option.ClientOption{
-		option.WithEndpoint(internal.ProdAddr),
 		option.WithScopes(logging.AdminScope),
 	}, opts...)
 	lc, err := vkit.NewClient(ctx, opts...)

logging/logging.go

@@ -141,7 +141,6 @@ func NewClient(ctx context.Context, parent string, opts ...option.ClientOption)
 		parent = "projects/" + parent
 	}
 	opts = append([]option.ClientOption{
-		option.WithEndpoint(internal.ProdAddr),
 		option.WithScopes(WriteScope),
 	}, opts...)
 	c, err := vkit.NewClient(ctx, opts...)

spanner/client.go

@@ -36,7 +36,8 @@ import (
 )
 
 const (
-	endpoint = "spanner.googleapis.com:443"
+	endpoint     = "spanner.googleapis.com:443"
+	mtlsEndpoint = "spanner.mtls.googleapis.com:443"
 
 	// resourcePrefixHeader is the name of the metadata header used to indicate
 	// the resource being operated on.
@@ -166,7 +167,8 @@ func NewClientWithConfig(ctx context.Context, database string, config ClientConf
 	}
 	// gRPC options.
 	allOpts := []option.ClientOption{
-		option.WithEndpoint(endpoint),
+		internaloption.WithDefaultEndpoint(endpoint),
+		internaloption.WithDefaultMTLSEndpoint(mtlsEndpoint),
 		option.WithScopes(Scope),
 		option.WithGRPCDialOption(
 			grpc.WithDefaultCallOptions(